Thanks goes to Tantric for this emulator.
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Installation and useage

Install IOS58 first, unzip the IOS58 installer archive, open the apps folder and copy the IOS58-installer folder to the apps folder of your Wii's SD card. Run this installer from the homebrew channel.

If you are using the Homebrew Channel just copy the apps directory from the archive to the root of your SD card.

ROMs & saves files should be stored in the snes9xgx folder on the root of your SD card or USB flash drive. You can copy the snes9xgx directory from the archive to your support drive. Your SNES rom images must be in SMC, SFC, SWC, or FIG format. To be clear, there will be 2 "snes9xgx" folders. One in your apps folder, and one on the SD root.

* Changed default folders to snes9xgx/roms and snes9xgx/saves. Old folders will be automatically moved to the new location
* File browser now scrolls down to the last game when returning to browser
* Auto update for those using USB now works
* Fixed scrollbar up/down buttons
* Minor optimizations

* added: now uses SNES 1.51 core (thanks to eke-eke for help with this)
* added: cheats menu! Loads .CHT file from /snes9x/cheats folder, .CHT file name must match file name of ROM
* added: load/save preference selector. ROM, SRAM, Freeze, and preferences are saved/loaded according to these
* added: preliminary Windows file share loading/saving (SMB) support on Wii: You can input your network settings into snes9xGX.xml, or edit s9xconfig.cpp from the source code and compile.
* added: 'Auto' settings for save/load - attempts to automatically determine your load/save device(s) - SD, USB, Memory Card, DVD, SMB
* added: ROM Information page
* added: Game Menu - all game-specific options are here now: SRAM save/load, Snapshot save/load, game reload, etc
* added: Credits page
* fixed: sd gecko works now
* fixed: full USB support
* changed: menu structure
* changed: preferences are now loaded and saved in XML format. You can open snes9xGX.xml edit all settings, including some not available within the program
* changed: if Home button is pressed when a game is running, Game Menu pops up
* changed: if preferences can't be loaded at the start and/or are reset, preferences menu pops up - remove to save your preferences!
* changed: SRAM load - game reloaded automatically after loading SRAM

004 - August 5, 2008

* added: option to disable AA filtering (snes graphics 'crisper', AA now default OFF)
* added: mapped zooming and turbo mode to classic controller
* added: preliminary usb support (loading)
* changed: sram and freezes now saved by filename, not internal romname. If you have multiple versions of the same game, you can now have srams and freezes for each version. A prompt to convert to the new naming is provided for sram only.
* changed: by default, autoload/save sram and freeze enabled

* added: classic and nunchuk support
* added: all controllers can now be configured
* added: GC version (untested)
* changed: mappings are no longer stored in SRAM, but in config file. This means no per-game configurations, but one global config per controller.
* one makefile to make all versions. (thanks to snes9x143 SVN)